Retainer device for demountable punches, dies, and the like



Feb. 5, 1946. A. s. GULLBERG 2,393,936-

RETAINER DEVICE FOR DEMOUNTABLE PUN CHES, DIES, ANDTHE LIKE Filed Feb. 26, 1944 1|, a I m v INVENTOR. 4/?THUR G. 61/44552 BY I .4 TTORNEYS UNITED STATE s PATENT OFFICE RETAINER DEVICE FOR DEMOUN TABLE PUNCHEQDIES, AND THELIKE Arthur G. Gullberg, RockyRiver, Ohio Application February 26, 1944, Serial No. 524,091

3' Claims.

This invention relates to an improved form of retainer device for a demountable punch and die or the like.

In this general class of devices it has usually been the practice to remove the die and punch from the rear with the inconvenience of having to remove the hardened. plate which afiords a backing therefor in each instance and later replacing the same. Then, in order to improve thissituation, there has been. devised. a securing means for the punch and die so that they may be released and removed and replaced without. the inconvenience above referred to, asfor instance disclosed in the patent to. Richard et al;, No.

1,621,811, March 22, 1927; and it is upon this. type of device that my present invention is "an. improvement.

The object of the present deviceis'to provide such a retaining means for a punch and die or other such tool, that will not only permit the removal and replacement of the punch and die without having to disassemble any of the other parts, but at the" same time. will holdthe punch and die securely in set position.

Another object is to provide such a device which can be both applied and released in a convenient and dependable manner even. after a prolonged period of time.

Another object is to provide such a device with means for preventing accidental turning of. the punch or die out of true position- .Another object istoprovide such a device that is of comparatively simple and inexpensive con struction.

Other objects will appear from the following description and claims when considered together with the accompanying drawing.

Fig. 1 is a vertical sectional view of my improved-device. shown applied to both a' punch and die, this view corresponding to line l-i of Fig. 2; and

Fig. 2 is a view taken on line 2-20f Fig. 1.

It is to be understood that the present form of disclosure is merely for the purpose of illustration and that there might be devised various provedscrew means 1 for thepunch and alike means .18 for the die, whereby they can be removed and other, punches and dies inserted without, dis.-

.turbing the plates'3 and 6. i

tion..

modifications thereof without departing fromthe spirit of my invenion as herein claimed.

In the present drawing, I have shown the set forth and punch I mounted with sliding fit in the retainer The upper end of the punch shank is provided with an arcuate screw threaded portion. la for operative: engagement by the screw-threaded member 1; so that, with the screw member l in position and upon insertion of thepunch l sufiflciently for its threads to become" engaged by those. of the member 1,,thepunch may be raised into fully assembled position by'merely turning the member 1 with a wrench from. the lower end. thereof the screw member 1 having, bearing engagement at its lower-end with the shoulder 9. during this. manipulation. Either right- .handxor left-hand threads may be employed,

either in case of screw member I or screw meme ber 8. I

When the punch I has beenbroughtflhomefl that is with its upper or'rear end bearing against the. plate 3,. such bearing engagement with this cluded by the interengagement between, the' threaded portionsof the punch andmember 1 and theabutment of the lowerend of the member 1 against the shoulder 9.

Then, when it is desired to remove the punch I, it is merely necessary to turn the member 1 from below in the opposite direction, whereupon the punch will be moved downwardly out of the retainer block 2, the upper, endiof thescrewmemzber .1 having, bearing engagement against the plate. 3 during this manipulation. Another punch may then-beinserted from below in the same manner as above explained and without havin to remove the plate 3.

Likewise the screw member 8* is. inserted'upwardly: into. a-v hole in the bottom of the retainer block 5 and will be ofsomewhatless lengththan the hole. in which it isv housed. The screw member 8' has. operative engagementwith. the arcuate screw-threaded portion. 4a of: the die 4- for insertion or removal thereof by turning the screw member 8 in one direction orv the other, and may,

be turned by applying to theinside of its upper end a wrench through the restricted opening l2 which is a continuation of the larger hole in which thescrew member 8 is housed. The hole for'screw 8 is 'plain, as in case of screw I.

After firstinserting the-screw member 8 into its hole in the block 5, the plate 6 is secured in position. Then upon inserting the die 4 into its opening, it may be brought to fully assembled Hposition by turning the screw member 8 while engaging the threaded portion 4a, until the die is brought home against the plate 6, the upper end of the screw member 8 having bearing engagement against the shoulder H during this end of this screw 8 has bearing engagementwith the plate 6; and anotherdie may be inserted from above in themanner above explained. i

The key I3 will prevent turning of the punch with respect to the block 2 and this is important when the end of the punch is of a form, other than round. This key, whichis here shown of rec tangular form, may be of any other suitable form; anditis about two-thirds in the block 2 "and about one-third in the shank of the punch so as 'topreclude the danger of its accidental engagement by the shank of the punch, is tapered at its lower end, as indicated at I311, so as to facilitate the entranceof the key into the cut-Out portion of the shank of the punch upon insertion of the same into position.

The key I 3 will be properly locatedwith respect to the threaded portion la so that the key will come into engagement when the threaded .por-

tion Ia' isengaged by the screw member 1 and thus there will be ensured proper in'terengagemanipulation. In order to remove the'die 4, the a screw member 8 will be turned in the opposite direction by means of the wrench from the upper or forward side of the assembly while the'lower and also against longitudinal movement with V degree of dependability. The ready removal of the punch or die from the forward side of the retainer block, without having to remove the rear plate,,is of course a decidedadvantage ineither changing 'er renewing 'the punch or die; The provision of means for preventing turning of the punch or die out of true position, constitutes limited in its use to any particular type of tool but may be employed with different types of punch presses and various other machines in which a tool must be maintained against rotation 'ture therethrough that is adapted to'receive the shank portion of the tool with a sliding fit, a

plate secured to the rear side of said block and V affording a hardened backing forithe rear end of the tool, the tool shank being formed with an annularly restricted screw-threaded portion within said aperture, said retainer'block being provided with a second aperture therethrough adjoining only said screw-threaded portion of the tool shank and substantially parallel to the firstnamed aperture, and a screw member within said second-named'aperture in co-operative direct engagementwith the screw-threaded'portion of the tool shank for positioning andholding the thereto for rotation of the screw'member in either direction for the insertion or removal of the tool at the forward side of said retainer block."

2. .In a retainer device for demountable punch,

die or like tool, the/structure 'as stated in claim 1,

r and a key between the shank of the tool and said ment and relative straight-line movement be- 7 tween the screw I and the threaded portion I a.

The die 4 is provided with a key M which is form as the key 13, the key being formed with a 'tapered portion Ma for facilitating the insertion of the die 4. r In each instance, the key may be located at any point desired, the position indicated in Fig. 2

being only for the sake of convenience in the present illustration.

a My present form of device, which involves th same in such position. Also, the screw-threaded engagement between the punch or die and its screw member aiTords' an extended surface area for such interengagement and hence increases the dependability of such retaining means especially against the danger of the punch or die becoming accidentally removed during the with- I drawal. movement thereof. The screws! and B are readily accessible and there is nothing to "stick or to get out of order over a prolonged period of time and hence this device possesses a high I -for the same purpose and may be of the same retainer block for retaining the tool in proper relative arrangement with respect to the retainer block. V V

3. Ina retainer device for a punch, die ;or like tool that is'adaptedfor demountable engagement in a retainer block; a tool of such character that is provided with a shank portion, said shank portion having throughout its entire extent a plain cylindrical surface that is adapted for sliding engagement in the retainer blocktherefonsaid cylindrical surface having formed directly thereupon an annularly restricted portion of anal screw thread, the entire screw-threaded portion being substantially less than ninety degrees; in circumferential extent and being uninterrupted circumferentially throughout its entire extent, said'screw-threaded portion being adapted for direct and real screw-threaded engagement by a mating screw-threaded member for effecting such longitudinal sliding engagement of the tool .within the retainer block therefor and for retaining the same therein, and said shank portion having provision for preventing dislodgement of the same circumferentially from set position within the retainer block.

ARTHUR. G. GULLBERG. 

